随着云计算技术的不断发展，各种云计算平台也逐渐成熟，开源云平台OpenStack 也得到了各大IT 巨头的关 注和支持，发展迅速。本文论述了OpenStack 云平台的系统架构和系统的高可用性，着重描述了系统中实现高可用性采用的 两种模式：Active/Passive(主备模式)、Active/ Active（双活模式）。并对开放云平台OpenStack 中的各层次实现高可用性的实施 方案进行了剖析，为搭建OpenStack云平台时提高其可用性提供依据。

With the continuous development of cloud computing technology, a variety of cloud computing platforms are gradually mature. The open source cloud platform OpenStack has also gained the major IT giant's attention and support, which develops rapidly. This paper discusses the system architecture of the OpenStack cloud platform and the system's high availability, and focuses on the two modes of achieving high availability of the system: Active/Passive, Active/ Active. And the implementation of the high availability of OpenStack is analyzed, providing a basis for improving the availability in the construction of the OpenStack cloud platform.